Cells at Work! CODE BLACK

A newbie Red Blood Cell is one of 37 trillion working to keep this body running. But something’s wrong! Stress hormones keep yelling at him to go faster. The blood vessels are crusted over with cholesterol. Ulcers, fatty liver, trouble (ahem) downstairs … It’s hard for a cell to keep working when every day is a CODE BLACK! (Source: Kodansha USA)